For those interested, we would like to share some details of this event. It was noticed a couple weeks ago that a lack of memory conditon was present on the NANOG servers in Chicago. Temporary measures were taken to clear processes and restart the server, but this only temporarialy restored the server.
Working with onsite personel to upgrade the server with additional memory failed during the first announced maintenance. Compatible memory was located and tested leading to the second maintenance when it was successfully installed.
At this time we have increased the memory on the server and are at a stable point.
thank you for a simple, clear, and prompt post mortem. my only remaining curiosity is what was the original ram size and what is it now. randy